Jones has just turned 25, and he appears noticeably more solid and physically stronger than he did when he started making noise against the likes of Vera and Bader. And his technique is still loose, but it's definitely tighter than it was a couple of years ago.
Every fighter ages differently at every stage of their careers. But most
heavier fighters who don't heavily rely on explosive speed and superior reflexes tend to have their best fighting years around the age of 26-32, give or take. Most HW and LHW champions are aroundabout this age, if not a little older.
In your opinion, has Jones fully entered his prime years, or is there enough physical and technical improvement available to him that he can still be considered (slightly
) green or pre-prime?